Instrumentation

Question 1

What does ASV do?

Answer 1

Continuously changes the inspiratory PS on a breath-by-breath basis and during apneas

Question 2

What is the goal of ASV?

Answer 2

Even out the breathing variation by targeting recent average ventilation or volume

Question 3

What are the ASV adjustments for Respironics BiPAP AutoSV Advanced?

Answer 3

• EPAPmin and EPAPmax
• Pressure testing mode like AutoCPAP: Increases 1 cm H2O every 15 seconds if at least 2 obstructive events

Question 4

What are the PS adjustments for Respironics BiPAP AutoSV Advanced?

Answer 4

• Current breath’s starting PS based on prior breath’s PS and how far previous breath was from target volume with gain determined from the PS needed to reach a volume during the last 30 breaths
• Intrabreath adjustment of PS based on flow just before halfway point of inspiratory cycle if expected volume differs from target volume
• Limited by PSmin and PSmax

Question 5

How does Volume-Assured Pressure Support (VAPS) work?

Answer 5

Continuously changes the inspiratory PS on a breath-by-breath basis

Question 6

How is the goal of VAPS different from ASV?

Answer 6

VAPS targets a set goal volume or ventilation while ASV targets recent volumes or ventilation